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I don't think this classify as an NLP problem, there is almost no semantic analysis needed, it is more like a classification problem using categorical features. 

NLTK is surely valuable if you want to perform some text 'cleaning' or preprocessing before encoding the variables. The only NLP application that I think you could apply here is some sentiment analysis on the comments to extract extra features (like a number expressing the negativeness or positiveness of each comment). Nevertheless you might want to do that using some pre-trained models cause your dataset is pretty small.